Which tool is most suitable for performing drilling tasks in robust materials?

The hammer drill is specifically designed for drilling tasks in robust and dense materials, such as concrete and masonry. It operates by combining the rotational motion of a standard drill with a hammering action, allowing it to chip away at harder surfaces effectively. This dual action makes it highly efficient for penetrating tough materials that would be difficult for standard drills to handle.

In contrast, the other options serve very different purposes: hedge shears are intended for pruning and shaping plants, a half hatchet is designed for chopping wood, and a hinge handle is not a drilling tool at all, but rather relates to the mechanism of opening and closing doors or gates. Hence, when it comes to drilling in robust materials, the hammer drill stands out as the appropriate tool due to its unique capabilities.